While I do a lot of custom work, this is a first for me... . I like the idea, but with the newer CTDs I don't think it's easily possible in the engine compartment. There are so many constraints for space, power transfer, and cooling I don't think it can or should be done easily... . as far as an auxilary drive off the PTO, that can be done very easily, and practically. I would stay away from the hydraulic driven units, as the oil has to be cooled with extended use, and I would suggest a direct CV driveshaft or belt driven setup, mounted remotely under or in the bed. Weather proofing is a must with copper coiled generator heads. A utitlity bed makes a great place to hide one, but on a regular bed, perhaps a toolbox can be modified to fit. Either way, it's been done before, and can easily be done again, as all mentioned above.